Fig. 2.

Illustration of deposition of energy by incident photons in the scintillator and obtaining the analog signal from both PMTs (A, B). The signals from each side are sampled at four equally spaced thresholds with minimum values of 80 mV and maximum values of 320 mV. The sum of ${\text{TOT}}_i$, where i is the number of thresholds, gives the measure of energy deposition calculated by Eq. 1